Adjustable shore for concrete forms



May 6, 1930.

F. KAH N 1,75%312 ADJUSTABLE snomz FOR CONQRETE FORMS Filed July 23,1928 v 5 l 4 I I 1 6 ,Q 7 3 E 3k "i 8 INVJLNTOR.

A T TORNEYS FELIX KAHN, OF SAN FRANCISCO, CALIFORNIA ADJUSTABLE SHOREFOR CONCRETE FORMS Application filed July 23, 1928.

My invention relates to the general art of concrete-form construction,and, in particular, to posts or shores for supporting the planking, uponor against which the concrete is poured.

The economical use of lumber in concreteform construction, with regardtoits adaptability for re-use, is of prime importance, and has receivedmuch attention. Obviously, in

the case of posts or shores, in order to adapt them for use under variedlength conditions, they should be capable of linear adjustment.

It is to this end that my invention is directed, its special objectbeing the provision of a shore the novel construction of which enablesit to be adjusted lengthwise without the use of jacks, screws, bolts orlike paraphernalia, the process or act of adjustment being practicallycontinuous.

With this end in view my invention consists in the novel adustable shorehereinafter fully described by reference to the accompanying drawings,it being understood that changes may be made therein without departingfrom the spirit of the invention as defined by the claims hereuntoappended.

In the drawings Fig. 1 is a perspective view of my adjustable shore.

Fig. 2 is an elevation of the same.

Fig. 3 is across section on the line 3-3 of i Fig. 2.

1 is a foot-plate from which extends a guide of suitable nature hereshown in a simple form of diagonally positioned angle members 2, betweenwhich the post or shore 3 is fitted for linear adjustment.

Secured exteriorly to the angle members is an encircling strap 4:, oneor more in number, here shown as two.

At opposite sides, these straps are bent outwardly to form interiorlygrooved lugs 5.

' 6 is a U-shaped stirrup which removably receives the shore, the arms 6of the stirrup entering and sliding in the grooved lugs 5.

In these stirrup arms are made linear series of wedge seats of suitablenature, here shown as slots 7, which with relation to their respectivearms are staggered, as seen in Fig. 2.

Serial No. 294,764.

8 are lifting wedges, adapted to be driven into the slots 7, said wedgesbearing upon top of thestrap lugs 5.

Locking wedges 9, one of which is here shown, are adapted for seating inthe slots under the strap lugs.

It will now be seen that a shore of any suitable length may be initiallyfitted in the guide 2 and removably rest in the stirrup 6. It is thencapable of linear adjustment by the linear movement of the stirrup 6,due to the driving in of the wedges.

It will also be noted that due to its novel structure, and by the properuse of the wedges 8, the shore can be adjusted at will without theemployment of jacks, screws, bolts or the like. The wedges being drivenin on the two sides of the shore provide for a relatively staggeringarrangement of the slots 7 so that when the wedge on one side is fullyengaged, the wedge on the other side can just barely enter the slot.This gives opportunity to continually adjust the shore.

The shore can be permanently locked by driving in wedges such as 9, indirections opposite to the wedges 8, as clearly seen in Fig. 1. Byremoving the wedges, the shore will relieve the form members and theentire assembly may be dismantled for storing and reuse.

I claim 1. An adjustable shore for concrete forms comprising a post; aguide in which said post is fitted for linear adjustment; outwardlyprojecting lugs fixed to said guide; a U- shaped stirrup carrying thepost the arms of said stirrup being slidable in said lugs, and havingwedge-seats; and wedges adapted, in association with said seats andlugs, for linearly adjusting the post.

2. An adjustable shore for concrete forms comprising a post; a guide inwhich said post is fitted for linear adjustment outwardly projectinglugs fixed to said guide on opposite sides; a U-shaped stirrup in whichthe post is removably fitted, the arms of said stirrup being slidable inthe lugs, and having a linear series of slots staggered relatively toeach other and wedges adapted, in association with said slots and lugs,for linearly adjusting the post.

3. An adjustable shore for concrete forms comprising a post; a guide inwhich said post is fitted for linear adjustment; an encircling strapfixed to said guide and formed on 0 posite sides with outwardlyprojecting interiorly grooved lugs; a U-shaped stirrup in which the postis removably fitted, said stirrup having arms slidable Within saidgrooved lugs, said arms having a linear series of slots; and Wedgesadapted, in association with said slots and lugs, for linearly adjustingthe'post.

4. An adjustable shore for concrete forms comprising a post; a guide inwhich said post is fitted for linear adjustmen t;.an encircling strapfixed to said guide and formed on opposite sides with outwardlyprojecting interiorly grooved lugs; a ill-shaped stirrup in which thepost is removably fitted, said stirrup having arms slidable within saidgrooved lugs, said 'arms'having a linear series of slots staggeredrelatively to each other; and

wedges adapted, in association with said slots and lugs, for linearlyadjusting the post.

In testimony whereof I have signed my name to this specification.

FELIX KAHN.

